Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Measurements and Metrology (Optical Clocks)
Q 14.5: Vortrag
Montag, 11. März 2019, 15:15–15:30, S SR 111 Maschb.
An extended-cavity diode laser at 497 nm for laser cooling and trapping of neutral strontium — Vladimir Schkolnik, •Oliver Fartmann, and Markus Krutzik — Humboldt-Universität zu Berlin
Among the best performing clocks are optical lattice clocks based on neutral strontium, which reach fractional uncertainties at the 2 · 10−18 level. To trap atoms efficiently in the optical lattice, temperatures of the order of µ K are neccessary. During the first laser cooling stage utilizing the broad 1S0 → 1P1 transition at 461 nm, atoms can decay towards the meta-stable 3P2 state with a branching of roughly 1 in 50,000. Several repump schemes have been employed. One possibility is the operation of only a single repump laser addressing the 3P2 → 3D2 transition at 497 nm.
Until now the generation of light at this wavelength relied on second harmonic generation (SHG) from an infrared laser due to the lack of GaN laser diodes directly operating in this range. This talk presents the first extended-cavity diode laser in Littrow configuration operating in the cyan wavelength range around 497 nm. We discuss our compact, simple and low cost laser source, which has the potential to simplify laser systems for efficient cooling of strontium.
This work is supported by the German Space Agency (DLR) with funds provided by the Federal Ministry of Economics and Technology (BMWi) under grant numbers DLR50WM1852 and 50WM1857.